David S. Buzby - SEC Form 4 Insider Trading Activity
Summary
Updated Aug 4, 2026
David S. Buzby has filed 1 SEC Form 4 filing across 1 company in the last 90 days.
Profile
David S. Buzby serves as Director of STEM, INC. (STEM). Buzby has also held reporting roles at Spring Valley Acquisition Corp. II (SVII). Buzby has reported 5 insider filings with the SEC since 2025. The most recent filing was in June 2026.
| Role | Director |
|---|---|
| Notability | 26/100 |
Board memberships
- STEM, INC.
- Spring Valley Acquisition Corp. II
Reported roles
- Director
- Director
Trading Pattern
InsiderAlpha's records for David S. Buzby go back to 2025: 5 primary Form 4 filings, an average of 2.5 per year. No transaction on record carries a Rule 10b5-1 flag - the filings look discretionary rather than pre-scheduled, which makes their timing more informative as a signal.
Career & Filing History
Every role David S. Buzby has reported on a Form 4, reconstructed from the filings themselves - reporting insiders must state their relationship to the issuer (officer title, director seat, or 10% ownership) on every filing.
- Director at STEM, INC. (STEM) - 1 filing, 2026
- Director at Spring Valley Acquisition Corp. II (SVII) - 1 filing, 2026
- Insider at STEM, INC. (STEM) - 3 filings, 2025
Recent Transactions
| Date | Ticker | Company | Code | Shares | Price | Value |
|---|---|---|---|---|---|---|
| 2026-02-26 | SVII | Spring Valley Acquisition Corp. II | D - Derivative transaction | 40.0K | - | |
| 2025-07-03 | STEM | STEM, INC. | G - Bona-fide gift | 5.5K | $0.00 | |
| 2025-07-03 | STEM | STEM, INC. | G - Bona-fide gift | 5.5K | $0.00 | |
| 2025-05-29 | STEM | STEM, INC. | M - Option exercise | 110.2K | $0.00 |
Companies - Last 90 Days
- STEM, INC. (STEM) - 1 filing, last 2026-06-04
Other Insiders Active in the Same Stocks
Insiders who reported open-market trades at the companies David S. Buzby has recently filed at. Multiple unrelated insiders buying the same stock within a short window - cluster buying - has historically been one of the strongest Form 4 signals.
- Matthew Tappin - $198K of STEM open-market activity in the last 12 months
- Arun Narayanan - $73K of STEM open-market activity in the last 12 months
- Rahul Shukla - $60K of STEM open-market activity in the last 12 months
- Michael James Carlson - $34K of STEM open-market activity in the last 12 months
- Saul R. Laureles - $19K of STEM open-market activity in the last 12 months
- Brian Musfeldt - $6K of STEM open-market activity in the last 12 months
More Notable Insiders
Other corporate insiders with significant SEC Form 4 track records on InsiderAlpha:
- Charles A. Davis
- Deep Track Biotechnology Master Fund, Ltd.
- Robert E. Dixon
- Romeo R. Dizon
- Kevin Michael Donahue
- DONEGAL MUTUAL INSURANCE CO
- DORCHESTER MINERALS OPERATING LP
- Robert W. Duggan
Frequently Asked Questions
Who is David S. Buzby?
David S. Buzby serves as Director of STEM, INC. (STEM). Buzby has also held reporting roles at Spring Valley Acquisition Corp. II (SVII). Buzby has reported 5 insider filings with the SEC since 2025. The most recent filing was in June 2026.…
How many SEC Form 4 filings has David S. Buzby submitted recently?
1 primary Form 4 filing in the last 90 days, covering 1 company.
Where can I see all of David S. Buzby's SEC filings?
All Form 4 filings, transaction values, and 10b5-1 plan flags are listed on this page and updated in real time as new SEC EDGAR filings are processed.
Learn More
Open the live David S. Buzby profile on InsiderAlpha for real-time alerts, AI-scored trade ideas, and full transaction history.